Form-cutter roll



June 7, 1932. J. c. SHAW ET AL FORM CUTTER ROLL Filed April 29, 1930 |NVENTOR$ BY (was Patented June 7, 1932 UNITED STATES PATENT OFFICE JOHN C. SHAW AND ROBERT D. SHAW, OF BROOKLYN, NEW YORK, ASSIGNORS TO PRATT & WHITNEY COMPANY, OF HARTFORD, CONNECTICUT, A CORPORATION OF NEW JERSEY FORM-CUTTER ROLL Application filed April 29,

This improvement relates primarily to an improved method of securing the knife or cutter blade in the metal or other roll for cutting material in the desired form.

Various methods have been employed for constructing form-cutter rolls for cutting inlay material and the like, but the difliculty has been in properly locating the cutting edge and securing the knife permanently in the roll.

In the present improvement, this object is accomplished by cutting a groove in the cylindrical face of the roll of the form desired, by means of an end mill maintained at all times With its axis extending radially of the roll, thereby cutting a groove having its central plane coincident with radial lines of the roll or a radial plane thereof.

A further object is to secure the knife in the groove so that the plane thereof or rather the plane of its cutting edge will coincide with the radial plane central of the groove. This is preferably accomplished by inserting a backing strip between one wall of the groove and the knife, the thickness of the backing strip being such asto locate the plane of the cutting edge in the radial plane of the roll central of the groove.

With the blade thus properly located by the backing strip, the space in the groove on the opposite side of the knife is filled with suitable packing material, such as lead or brass wool or the like, which is then calked home or into position for securely holding the knife in the roll.

One form of the improvement is more particularly illustrated in the accompanying drawing, in which Fig. 1 is a plan view of a broken away part of a form-cutter roll, showing the outline of the form in an irregularly shaped groove out in the cylindrical face of the roll and Fig. 2 is an end view of the roll partially in section, showing the knife secured therein.

Referring to the drawing, the roll A upon which the form-cutter knife or cutting blade is secured may be of iron, steel, brass or other suitable material, and may be solid or tubular as may be desired.

In the present instance,the outline of the inlay or other form to be out, is laid out on the 1930. Serial No. 448,338.

surface of the roll and a groove B, of the shape desired, is cut therein by any suitable or preferred means. Preferably the groove B cut means of an end mill, the axis of WhlCh is maintained, throughout the cutting operation in exact coincidence with a radial plane or line through the axis of the roll. This may be accomplished by suitably supporting the roll relative to the mill, for longitudinal and rotative movement, while maintaining the axis of the roll in the plane of the axis of the mill.

The knife 0 is preferably a thin blade of steel bent to conform to the shape or outline of the form to be cut and, as illustrated, is adapted to lie central of the groove B, so that the cutting edge D of the knife will lie in a radial plane of the roll, substantially as shown in Fig. 2 of the drawing.

In the present construction, the knife or blade C is approximately 25 thousandths of an inch in thickness and the groove B is approximately double the thickness of the knife. In order to locate the knife C in the groove B of the roll with the plane thereof through the cutting edge in coincidence with the cen tral radial plane of the groove, a backing strip E, of proper thickness and suitable material, is inserted between the face of the knife and the wall of the groove. The backing strip E may be bent to form from a strip of brass, steel or the like, as shown in Fig. 2, and preferably is inserted between the outer wall of the groove and the knife, and is of a thickness to bring the plane of the knife edge exactly in the radial plane of the groove, as aboveindicated.

In order to secure the knife C firmly in the groove B of the roll, the space on the opposite side of the knife from the backing strip E, is filled with lead or brass wool, turnings or other suitable material, which is afterwards firmly calked to permanently secure the knife or blade in place in the roll. Obviously, the melted lead or other suitable material may be poured into the space F and calked to secure ly hold the knife or blade in the groove 13 against the backing plate E, so that the cutting edge is in the central radial plane of the groove.

It will be seen that by this method, the groove B may be cut with a mill of sufficient diameter for proper sturdiness and strength and yet a suitable knife of thin sheet steel may be employed and properly located in the radial plane by a backing strip of suitable thickness, the knife and strip being. firmly secured in the roll by the calking material.

While the preferred form has been shown, it will be-understood that various modifications in the specific details may be'made without departing from the spirit and scope of the invention.

We claim 1. In a form-cutter roll, the method of securing the knife therein, which comprises cutting, a groove in the cylindrical'face of the roll having the contour of the form to be cut with the centralplane the groove radial of the roll, inserting the knife in the groove so that a-plane parallel with the sides of the knife through the cutting. edge thereof coincides with saidcentral radial plane, inserting a backing strip between the knife and one wall of the groove for permanently locating said-plane of the cutting edge coi-neid ent withthe radial plane of the groove and then securingthe knife in that position by filling the remai-ning, space in the groove with metal calking material and calking it;

2. A form-cutter roll comprising a roll having a groove on its cylindrical face, thecenter line: of which follows the contour of the form to be cut, said center line being in a plane. extending radially of the roll, a knife located in said groove and having its cutting edge in said central plane of the groove, a backing strip between one wall of the groove andtheknife for maintaining the cutting edge thereof. in said central radial plane of the groove and metal calking material between: the knife andvthe other wall of the groove fore securing the knife in the roll.

3. Aform-cutter rol-l comprising a roll having; a radial groove on its cylindrical face of theoutline of the form to be out, said groove hayi ng itswalls parallel with a central radial plane, a-knife located in the groove with the plane. of itscutting edgein said central radial plane, a backing: stripbetween the knife and one wall of the groove for maintaining the knife with the plane of its cutting: edge in said'centralplane of" the groove and metal calkin-g material calked: between the knife-and the other wall of the grooveto secure the knife in the-roll.

JOHN G. SHAW. ROBERT D. SHAW. 

